Unusual 1920's JOOP Norwegian cork puller. I haven't actually tried this one yet, but one would slide the saw like blade between the cork and the bottle, turn the blade sideways, and the pull the cork out.

I might try it tonight, and report back if it genuinely works--or at least works well.

It is a fascinating cork puller. If you have an antique, vintage or unusual corkscrew, drop me a line at josef@vintagecorkscrews.com